Looks like the old Do-It tube jig head mold that made three size's. Tube Skirt Jig - Sz: 1/8, 1/4, 3/8 - Hk: 570 or 575 - Collar: None the one shown is the 1/4th oz. the mold is only set for aberdeen hooks so if you want a heavier hook you'd have to mod the mold.